Back-rest for turning-lathes.



J. T. MEYERS.

BACK REST FOR TURNING LATHES. APPLICATION FILED NOV. 23, 1907.

Patented Sept. 15, 1908.

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noomtoz 195 in cows TH: NORRIS FETEPS 60., WAsulNc'IoN, D. C.

J. T. MEYERS.

BACK BEST FOR TURNING LATHBS.

APIFLIOATION FILED NOV. 23, 1907.

Patented Sept. 15, 1908.

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JOHN THEODORE MEYERS, OF DELPHOS, OHIO.

O BACK-REST FOR TURNING-LATI-IES.

Specification of Letters Patent.

Patented Sept. 15, 1908.

Application filed November 23, 1907. Serial No. 403,518.

To all whom it may concern:

Be it known that I, JOHN THEODORE MEY- ERs, citizen of the UnitedStates, residing at Delphos, in the county of Allen and State of Ohio,have invented certain new and useful Improvements in Back-Rests forTurning- Lathes, of which the following is a specification.

This invention is a back-rest for woodturning lathes, and has for itsobject to provide a back-rest which can be readily adj usted fordifferent sized sticks, and which will bear on the stick at three pointswith a minimum amount of friction.

In the accompanying drawings, Figures 1 and 2 are elevations of theinvention taken from opposite sides. Fig. 3 is a transverse section onthe line 3-3 of Fig. 1. Fig. 4 is an end view.

Referring specifically to the drawings, 5 denotes a plate having adepending stem 6 whereby it is mountedon the bed of the lathe. On oneside of the plate s a dovetailed groove 7 in which is mounted a slidecomprising a plate 8 suitably shaped on one side to fit in the groove.The slide has a longitudinal slot 9. On one end of the slide is mounteda roller 10 which projects from said end sufficiently to engage thestick or work.

On one side of the plate 5 is fulcrunied a hand-lever 11 which isconnected by a link 12 to the plate 8 whereby the latter may be movedback and forth in the groove 7. On the top edge of the plate 5 is asegment 13 which is engageable by a hook 14 on one end of a stem 15which extends transversely through a hole in the hand-lever 11. At theopposite end of the stem is a groove 16 into which extends the edge of adisk 17 having a cam-face 18. This disk is pivoted at 19 on thehand-lever 11 and has a handle 20. The hook 14 is clamped to the segment13 by turning the disk 17 on its pivot, whereupon the cam 18, by itsengagement with the end of the groove 16, draws the stem 15 through thehole in the lever 11 in the direction to bind the hook against thesegment. This locks the hand-lever and holds the plate 8 at adjustment.Upon turning the disk 17 in the opposite direction, the cam releases thehook from the segment and the plate is then free to be slid in or out onthe plate 5.

On the face of the plate 8 is slidably mounted a plate 21 having on oneside a rib 22 which fits in the slot 9. On the other side of this plateare studs 23 on which are pivoted aw-members 24 carrying frictionrollers 25 at their outer ends. The inner ends of the j aw-members areformed with cogs 26 which mesh so that the jaws may move together. Theplate 21 carries a disk 27 for a purpose to be hereinafter described.This disk is rotatably mounted on a stud 28 having a reduced end 29which screws into the plate and projects from the back thereof. A portion of the rib 22 is cut away to form a recess 30 to receive a nut 31screwed on the thread ed end of the stud whereby the latter is secured.The width of the recess 30 is such .that the nut is prevented fromturning there- The back of the plate 5 has a groove 32.

Upon unscrewing the stud 28, the plate 21 can be slid back and forth onthe plate 8, and it will be securely clamped in adjusted position by thenut 31 and the shoulder formed by the reduced portion 29 of the stud,said shoulder engaging the face of the plate 21, and the base of the nutengaging the floor of the groove 32. Inasmuch as the nut cannot turn byreason of its location in the recess 30, it will be necessary to turnthe stud to make the adjustment stated. The nut and the rib 22 do notproject beyond the groove 32 and therefore do not interfere with theadjustment of the plate 8 on the plate 5.

The jaw-1ne1nbers 24 work between the face of the plate 21 and the backof the disk 27, the latter being spaced from said plate sufficiently forthis purpose. On the back of the disk are cam-grooves 33 into whichextend studs 34 projecting from the jawmem bers. The cam-grooves areinclined in such a direction that the jaw-members are caused to openwhen the disk is turned in one direction and to close when it is turnedin the opposite direction. On the stud 28, between its head 35 and theface of the disk 27, is mounted an arm 36 carrying an adjustable weight37. The arm is loose on the stud and swings between stop projections 38on the face of the disk.

In use, the jaw-members 24 are opened, and the plates 8 and 21 areadjusted in the manner herein described so as to bring the roller 10against the stick on one side thereof, and the jaw-members in such aposition that when they are closed the rollers 25 will bear against thestick at the top and bottom thereof. The weighted arm 37 is sopositioned that when it engages one of the stops 38 it tends to turn thedisk 27 in a direction which will close the aw-members, and the weight38 is heavy enough to hold the rollers 25 firmly against the stick.

By the construction herein described a wide range of adjustments is had,and the stick is held in three places with a minimum amount of friction.By the plate 8, the 'entire apparatus can be moved toward or from thestick, and by making the plate 21 adjustable also, the relative positionof the rollers 10 and 25 may be varied according to the dimension of thestick. The weight will be adjusted to suit the work. It takes moreweight to hold some sticks, and some can be held firmer than others. Thestick can also be out between the rollers 25, the weight closing thejaws so that the rollers follow up the stick as it gets smaller. Theroller 10 can 'be moved forward by the hand-lever 11.

I claim':

1. A back-rest for turning-lathes comprising a support, an adjustableplate thereon, bearings carried by the plate and engageable yieldinglywith the work, and a stationary bearing on the support between theyielding bearings.

2. A back-rest for turning-lathes comprising a support, a slide mountedthereon, a plate adjustable on the slide,bearings carried by the plateand engageable yieldingly with the work, and a stationary bearing on theslide between the yielding bearings.

3. A back-rest for turning-lathes comprising a support, a slide mountedthereon and having a longitudinal slot and a groove on one side, a plateon the slide having a rib fitting in the slot and extending into thegroove, jaw-members pivoted to the plate and provided with bearingsengageable with the work, a similar bearing on the slide between thejaw-members, a stud screwed into the plate and passing through theaforesaid slot into the groove, the aforesaid rib being cut awayadjacent the projecting end of the stud to form a recess, a nut screwedon said end of the stud and seating in the recess, the base of said nutengaging the floor of the groove, a disk rotatably mounted on theopposite end of the stud and having camgrooves, and studs on thejaw-members entering said cam-grooves.

4. A back-rest for turning-lathes comprising bearings engageable withthe work yieldingly, and a stationary bearing between the yieldingbearings.

5. A back-rest for turning-lathes comprising bearings engageable withthe work yieldingly,- a stationary bearing between the yieldingbearings, and means for varying he relative position of said bearings. i

In testimony whereof I affix my signature, in presence of two witnesses.

JOHN THEODORE MEYERS.

Witnesses:

CHAS. F. WEGER, DAVID KAVERMANN.

